Sum Rate of Massive MIMO Systems Deploying Uniform Circular Planar Array Base Station Antenna

Abstract

We consider the sum rate of massive multiple input multiple output (MIMO) systems where the base station (BS) antenna configuration is uniform circular planar array (UCPA). The channel considered is line-of-sight (LOS) governed by the antenna steering vector of each user. The user azimuth and elevation angles are assumed independent and uniformly distributed. The BS performs maximum ratio transmission (MRT) beamforming due to its low complexity and acceptable performance for low to moderate signal-to-noise ratio (SNR). The sum rate performance is then analyzed and compared to the upper bound sum rate obtained by assuming favorable propagation in massive MIMO. It is shown that using a larger amount of antennas increases the slope of the sum rate curve.